python3的datetime无法相减

Question

import datetime
date1 = datetime.datetime(2019, 6, 1)
date2 = datetime.datetime.now().strftime("%y-%m-%d %H:%M:%S")
print(date2-date1)

提示：TypeError: unsupported operand type(s) for -: 'str' and 'str'

Answer 1

import datetime
date1 = datetime.datetime(2019, 6, 1)
date2 = datetime.datetime.now()
a = (date1-date2)
print(a.days)

你提问上的print(date2-date2)是不是写错了